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Ultralow-temperature high-toughness special nodular cast iron metal material and preparation method thereof

A technology for ductile iron and metal materials, which is applied in the field of ultra-low temperature and high toughness special nodular cast iron metal materials and its preparation, can solve the problems of easy brittle fracture, failure to meet the performance requirements of equipment accessories, and low low temperature impact toughness of ordinary ductile iron. The effect of high safety performance requirements, high practical value and promotion significance, and good structural performance

Inactive Publication Date: 2015-03-25
SHANDONG YUANTONG MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the low low-temperature impact toughness of ordinary ductile iron, it is prone to brittle fracture in cold environments, which cannot meet the performance requirements of equipment accessories working in low-temperature environments, and is not suitable for the production of high-speed trains, wind power and other equipment accessories.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The mass ratio of raw materials for smelting alloy cast iron is: 95 parts of 10# pig iron, 5 parts of rust-free first-grade steel scrap, 2 parts of 75# ferrosilicon, 3 parts of 65# ferromanganese, 1 part of bismuth iron containing 99.99 parts of bismuth, using intermediate frequency Melting in an induction furnace, after the temperature reaches 1530°C, add 0.8 parts of silicon-barium inoculant, 1.6 parts of QRMg6RE2 rare earth magnesium-silicon-ferrosilicon alloy, which is processed by inoculation and spheroidization before the furnace, and the liquid mixture after spheroidization at 1350°C to 1380°C Cast it into the hub casting mold, and slowly cool it in the casting mold to below 500°C, and then remove it from the casting mold to obtain the hub.

[0028] The weight of a single piece of the wheel hub is 37.5kg, and the average wall thickness is 20mm. The casting process of the wheel hub is a furan resin self-setting sand molding process.

[0029] After inspection, the ...

Embodiment 2

[0033] The weight ratio of raw materials for smelting alloy cast iron is: 92 parts of 10# pig iron, 8 parts of rust-free first-class steel scrap, 1 part of 75# ferrosilicon, 2 parts of 65# ferromanganese, 0.5 part of bismuth iron containing 99.99 parts of bismuth, using Melting in an intermediate frequency induction furnace, after the temperature reaches 1530°C, the chemical composition is detected by a spectrometer, 0.5 parts of silicon-barium inoculant and 1.8 parts of QRMg6RE2 rare earth magnesium-silicon-iron alloy are added. The steering axle box is obtained in the sand mold cavity.

[0034] The single piece weight of the steering axle box is 65.5kg, and the average wall thickness is 22mm. The casting process of the steering axle box is a furan resin self-setting sand molding process.

[0035] After inspection, the chemical composition of the steering axle box is: C: 3.78%, Si: 1.82%, Mn: 0.178%, P: 0.023%, S: 0.016%, Bi: 0.0049%, Mg: 0.052%, Re: 0.022% .

[0036] The t...

Embodiment 3

[0039] The weight ratio of raw materials for smelting alloy cast iron is: 94 parts of 10# pig iron, 6 parts of rust-free first-class steel scrap, 1.5 parts of 75# ferrosilicon, 2.5 parts of 65# ferromanganese, 0.8 part of bismuth iron containing 99.99 parts of bismuth, using intermediate frequency After the induction furnace is melted and the temperature reaches 1530°C, the chemical composition is detected by a spectrometer, and 0.7 parts of silicon-barium inoculant and 1.7 parts of QRMg6RE2 rare earth magnesium-silicon-iron alloy are added, which are processed by inoculation and spheroidization before the furnace, and poured into the sand mold cavity of the wheel hub Get the hub inside.

[0040] The weight of a single piece of the wheel hub is 37.5kg, and the average wall thickness is 20mm. The casting process of the wheel hub is a furan resin self-setting sand molding process.

[0041] After inspection, the chemical composition of the hub is: C: 3.69%, Si: 1.91%, Mn: 0.176%,...

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Abstract

The invention discloses an ultralow-temperature high-toughness special nodular cast iron metal material and a preparation method thereof. The ultralow-temperature high-toughness special nodular cast iron metal material comprises the following raw materials in parts by weight: 92-95 parts of pig iron, 5-8 parts of scrap steel, 1-2 parts of silicon iron, 2-3 parts of ferromanganese, 0.5-1 part of bismuth iron, 1.6-1.8 parts of a nodulizing agent and 0.5-0.8 part of an inoculant. The ultralow-temperature high-toughness special nodular cast iron metal material is prepared by smelting the pig iron, the scrap steel, the silicon iron, the ferromanganese, the bismuth iron and the inoculant in an electric furnace, performing metamorphic inoculation before furnace, casting forming and cooling. The ultralow-temperature high-toughness special nodular cast iron metal material has good structural performance, casting forming performance and machinability, can be applicable to workplaces with high requirements on high toughness, high strength, high wear resistance, cold resistance, corrosion resistance, shock absorption and safety performance, can be applied to high-speed trains, a wind power industry, vehicles, petroleum, a petrochemical industry and other industries, has relatively cheap raw materials, and has a very high practical value, a very high promotional significance and a wide market prospect.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to an ultra-low temperature and high toughness special nodular cast iron metal material and a preparation method thereof. Background technique [0002] With the rapid development of industries at home and abroad, the performance requirements for ferritic ductile iron with low temperature toughness in ductile iron are increasing, not only for its tensile strength, elongation, and yield strength at room temperature. The toughness at low temperature also puts forward requirements, so that the original brand of low-temperature ductile ductile iron can no longer meet the requirements. The new requirements are prominently reflected in the rapid development of high-speed trains, wind power generation, vehicles, petroleum and petrochemical equipment and other accessories in China. . For example: With the rapid development of my country's rail transit, the demand for ferritic ductil...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/04C22C33/08C21C1/10
CPCC22C33/08C22C37/04C22C37/10Y02P10/20
Inventor 周仕勇李兴华赵桂菊
Owner SHANDONG YUANTONG MASCH CO LTD
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